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时间:2020-03-27
《不同价态铬的土壤碱性磷酸酶效应模拟研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2010,29(1):104—109JournalofAgro—EnvironmentScience不同价态铬的土壤碱性磷酸酶效应模拟研究和文祥1,王娟1,高亚军,田海霞1,曹卫东2(1.西北农林科技大学资源环境学院,陕西杨凌712100;2.中国农业科学院农业资源与农业区划研究所,北京100081)摘要:铬是环境中四大污染元素之一,其不同价态间对生物的生态毒性差异较大。采用模拟方法对Cr3+和Cr6+的土壤碱性磷酸酶效应进行了研究。结果表明,铬显著抑制了土壤碱性磷酸酶活性,其中Cr3+的抑制作用远强于C一,土壤轻度Cr
2、3+和Cr6+污染时的临界浓度分别为151和1132mg·kg-19二者相差6.5倍;碱性磷酸酶活性及动力学特征参数y—k等与Cr浓度间达显著或极显著负相关,揭示土壤磷酸酶活性及y一、k可作为土壤Cr污染的监测指标之一;模型U=30/(3。xC+1)揭示酶与铬间的机理为完全抑制,动力学则进一步细化为非竞争性抑制;计算获得的抑制常数K为Cp3、4—06EffectofDifferentValencesChromiumonSoilAlk—phosphataseCharacteriticsHEWen-xian91,WANGJuanl,GAOYa-junl,TIANHai-xial,CAOWei-don92(1.CollegeofResourcesandEnvironment;NorthwestA&FUniversity;YanglingShaanxi712100,China;2.InstituteofAgriculturalRe-sourcesandRegionalPlannin4、g,ChineseAcademyofAgriculturalSciences,Beijing100081,China)Abstract:Chromiumiswasoneoffourheavymetalstopolluteenvironment.However,itsecologicaltoxicitytoorganismvariesconsiderablyfordifferentspeciesofchromium.Inthispaper,bysimulative,soilalkalinephosphataseparametersarea5、ppliedtostudytheeffectofdifferentvalenceschromium.ResultsshowedthattheSoilalkalinephosphataseactivitywasremarkablyinhibitedbychromium.CpwasmoreseriouslyinhibitedthanC一,thecriticalconcentrationswere151mg·kg一1and132mg·kg一1forCr3+andC—respectivelywhensoilisslightlypolluted,6、6.5timesdifferencebetweenCd+andCr6+.Alkalinephosphataseactivity,y—andkcouldbeindexestomonitorsoilspollutedbychromium,‘‘“‘1‘‘“‘1‘1‘⋯1‘‘becausethereweresignificantorremarkablysignificantcorrelationbetweensoilalkalineDhosDhataseDarametersandchromiumconcentra-tions.Theirreac7、tionmechanismwasfullyinhibitedbymodelU=30/(31×C+1),andnon-competitiveinhibitionbysoilenzymekineticfurther.TheinhibitionconstantKiwasCr3+8、istic,inhibitionconstant土壤酶作为土壤重要组成部分,在营养物质转酸酶催化后,毒性降为母本化合物的O.5%~1.67%t5],化、能量代谢、污染土壤修复等过程中发挥着重要作从而修复环境
3、4—06EffectofDifferentValencesChromiumonSoilAlk—phosphataseCharacteriticsHEWen-xian91,WANGJuanl,GAOYa-junl,TIANHai-xial,CAOWei-don92(1.CollegeofResourcesandEnvironment;NorthwestA&FUniversity;YanglingShaanxi712100,China;2.InstituteofAgriculturalRe-sourcesandRegionalPlannin
4、g,ChineseAcademyofAgriculturalSciences,Beijing100081,China)Abstract:Chromiumiswasoneoffourheavymetalstopolluteenvironment.However,itsecologicaltoxicitytoorganismvariesconsiderablyfordifferentspeciesofchromium.Inthispaper,bysimulative,soilalkalinephosphataseparametersarea
5、ppliedtostudytheeffectofdifferentvalenceschromium.ResultsshowedthattheSoilalkalinephosphataseactivitywasremarkablyinhibitedbychromium.CpwasmoreseriouslyinhibitedthanC一,thecriticalconcentrationswere151mg·kg一1and132mg·kg一1forCr3+andC—respectivelywhensoilisslightlypolluted,
6、6.5timesdifferencebetweenCd+andCr6+.Alkalinephosphataseactivity,y—andkcouldbeindexestomonitorsoilspollutedbychromium,‘‘“‘1‘‘“‘1‘1‘⋯1‘‘becausethereweresignificantorremarkablysignificantcorrelationbetweensoilalkalineDhosDhataseDarametersandchromiumconcentra-tions.Theirreac
7、tionmechanismwasfullyinhibitedbymodelU=30/(31×C+1),andnon-competitiveinhibitionbysoilenzymekineticfurther.TheinhibitionconstantKiwasCr3+8、istic,inhibitionconstant土壤酶作为土壤重要组成部分,在营养物质转酸酶催化后,毒性降为母本化合物的O.5%~1.67%t5],化、能量代谢、污染土壤修复等过程中发挥着重要作从而修复环境
8、istic,inhibitionconstant土壤酶作为土壤重要组成部分,在营养物质转酸酶催化后,毒性降为母本化合物的O.5%~1.67%t5],化、能量代谢、污染土壤修复等过程中发挥着重要作从而修复环境
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